**The simplification of expressions consists of creating an equivalent expression written in a shorter and simpler way in which we combine all of the similar terms (collecting like terms).**

**For example, the expression:**

$3+3+3+3+3+5X-3X$

**After having simplified it, it would be:**

$15+2X$

What we have done is created two groups of numbers and variables:

$3+3+3+3+3$ and $5X-3X$.

This can be simplified further, resulting in only two terms:$15+2X$